/*
 * Copyright (C) 2012, 2013 Apple Inc. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 
 */

#pragma once

#include "include/JavaScriptCore/runtime/IndexingType.h"
#include "include/JavaScriptCore/runtime/JSArray.h"

namespace JSC {

    class ArrayAllocationProfile {
    public:
        ArrayAllocationProfile()
                : m_currentIndexingType(ArrayWithUndecided), m_lastArray(0) {
        }

        IndexingType selectIndexingType() {
            JSArray *lastArray = m_lastArray;
            if (lastArray && UNLIKELY(lastArray->indexingType() != m_currentIndexingType))
                updateIndexingType();
            return m_currentIndexingType;
        }

        JSArray *updateLastAllocation(JSArray *lastArray) {
            m_lastArray = lastArray;
            return lastArray;
        }

        JS_EXPORT_PRIVATE void updateIndexingType();

        static IndexingType selectIndexingTypeFor(ArrayAllocationProfile *profile) {
            if (!profile)
                return ArrayWithUndecided;
            return profile->selectIndexingType();
        }

        static JSArray *updateLastAllocationFor(ArrayAllocationProfile *profile, JSArray *lastArray) {
            if (profile)
                profile->updateLastAllocation(lastArray);
            return lastArray;
        }

    private:

        IndexingType m_currentIndexingType;
        JSArray *m_lastArray;
    };

} // namespace JSC
